Definition of periapsis in English:

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Pronunciation: /ˌpɛrɪˈapsɪs/

noun (plural periapses /ˌpɛrɪˈapsiːz/)

The point in the path of an orbiting body at which it is nearest to the body that it orbits.
Example sentences
  • For objects orbiting Earth, periapsis and apoapsis are known as perigee and apogee; for objects orbiting the Sun, these locations are known as perihelion and aphelion.
  • At periapsis [closest approach to Saturn] it's about 40 kilometers per second [90,000 miles per hour].

For editors and proofreaders

Line breaks: peri|apsis

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